The act (or acts) of doing very well in ones current position.
:Used and started primarily by motorcyclists:
Refers to the act of balling up the rubber on your motorcycle tires.
"Riding Fast"

1:"Damn! Did you see him ballin' it up out there on the track today?" 2:"Wow you were ballin' it up on the dance floor the other night!" 3: Jack: "what are you doing tonight bob?" Bob: "Oh I'm just ballin' it up here at home."